Increase variable Slower

Hi i have my game setup so that when you hold theleft mouse button down it adds 1 to a variable called Power and the longer you hold the left mouse in the more power you have, which works fine, but how do i slow it down the power goes up to fast, so say it adds 1 to the power every 0.2 seconds..?

add 0.1 to variable ;)

Or do a While conditions are true - Left key is down,

Every 0.2 second, add 1.

mouse button is down -> add 5*dt to power

will progresively add 5 to power per second so 1 per 0.2 seconds

Delta-time and framerate independence, an important tutorial to check out.

Thanks for the replies, i'll check the tutorial as well.